1, the sky: divided into phantom, virtual shadow and real illusion, from the novel Milo Qing Juan.
2, ghosts and gods: divided into nine, one of which is a natural ghost, also known as pick.
3. Mixed element: it can be called the origin of one, the giant of the heavens, dominating the sea of chaos.
4, mixed infinity: the peak of the heavens, the Tao exists and lasts forever.